21340975968 has 72 divisors (see below), whose sum is σ = 65356750368. Its totient is φ = 6566452992.

The previous prime is 21340975913. The next prime is 21340976009. The reversal of 21340975968 is 86957904312.

21340975968 is a `hidden beast` number, since 2 + 1 + 3 + 40 + 9 + 7 + 596 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2846280 + ... + 2853767.

It is an arithmetic number, because the mean of its divisors is an integer number (907732644).

It is a 1-persistent number, because it is pandigital, but 2⋅21340975968 = 42681951936 is not.

Almost surely, 2^21340975968 is an apocalyptic number.

It is an amenable number.

21340975968 is an abundant number, since it is smaller than the sum of its proper divisors (44015774400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21340975968 is a wasteful number, since it uses less digits than its factorization.

21340975968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5700076 (or 5700065 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 21340975968 in words is "twenty-one billion, three hundred forty million, nine hundred seventy-five thousand, nine hundred sixty-eight".